There's an idea that the old chalk figures were representations of constellations, possibly related to their position in the sky at certain times. The identifications I've seen are that "The Long Man of Wilmington" is Orion, Uffington is Taurus, and Cerne is Hercules. The trouble with this is that it's not easy to be sure that our ancestors saw the sky in the same way as we do, or that the people of these islands used the same interpretations as the Middle East. If they do represent star patterns, they are more likely to be obvious ones. The only one I'm convinced by is Wilmington, which has the geometry of the central seven stars of Orion. Given that Uffington is in an area long associated with horse rearing, and that Taurus faces the opposite way and is the wrong shape, the identification seems forced. Bulls, I would expect to be shown as more bulky, less speedy. If you look at star maps, you might find that Virgo looks more like the Horse, and it is possible to map the two roughly together. The Celtic goddess Epona had an equine manifestation, so such an identification is not wholly impossible. My mother objected to Orion for Wilmington, on the grounds that it had no sword. This is not an objection that could be raised in the case of Cerne, which is more like the geometry of the extended Orion than that of Hercules, in any case a faint constellation, especially if that object in his left hand is included. Just because the Romans thought that the figure resembled Hercules, doesn't mean that that was an earlier astronomical identity, if ther was one. I gather that morris is danced there on May Day. This is, interestingly, about the time when Orion sets just after sunset, the time when it ceases to be visible at all, & could be seen as going to the underworld. He reappears in the morning sky in August, appropriate for a god of vegetation. I'm not being precise, but it still works in the past with regard to harvests.(When I saw the Egyptian identification with Osiris, and how they saw the sword, I thought that it was a nice resonance with reality, where the sword is the seedbed of new stars.) These are only my ideas, by the way, though an astronomer friend regards them as being within the bounds of possibility. Nothing like this can be proved one way or the other.